It's a far left issue because the people on the right are constitution freaks that love guns, god and saying whatever the fuck they want consequences be damned.
I believe the Constitution is color blind. The words, "All men are created equal...", did not specify a race. The problem the right has the how the left tells them how to think.
This is where progressives go wrong. Stop telling people how they should think.
Frankly, I doubt the two sides are ever going to come to proper terms, and the best solution is just to give power back to the states. Then you can have libtard Portland and klan Mississippi, and people who don't like it can just move.